Rolls



(No Model.)

B. L. CLARK.

ROLL.

No. 390,203. Patented Oct. 2, 1888.

liwentar. WZM

EDiVARD L. CLARK, OF PITTSBURG, PENNSYLVANIA.

ROLLS.

SPECIFICATION forming part of Letters Patent No. 390,203, dated October 2, 1888.

Application filed April 19, 1886.

declare the following to be a full, clear, and

exact description thereof, reference being bad to the accompanying drawing,which is a front elevation of a set of my improved rolls.

In rolling metal strips or bands it has been usual to employ grooved rolls, the tongues of one roll fitting into and working in the grooves of the other. \Vhen steel strips or bands are rolled, the peculiar hardness of the metal is apt to break the corners of the tongues and to spoil the grooves, so that the rolls soon wear out and the operation is made very expensive. I have designed my improvement to obviate this diflieulty; and to that end my invention consists in rolling the steel strips by passing them between a plain roll and an adjacent grooved roll, the strip being reduced and elongated by successive passes between the rolls. This method of rolling is not successful for rolling iron bands or strips, because the iron spreads laterally in the rolls so much that it needs to be confined by collars on the rolls. Steel strips, however, spread very little in rolling, their principal extension being an elongation, and with them I have found by practical experience that this system of rolling is very effective.

In the drawing, which shows a three-high train of rolls, 2 and 3 are the grooved rolls,

Serial No. 199,338. (No model.)

and 4 is the intermediate plain roll, all being journaled in housings in the usual way.

a, b, c, and (1 indicate the passes through which the strip is fed in succession, and c and f are the finishing-passes.

As the strip is very thin when it is in condition to be put through the finishing passes, it is not necessary that thereshould be grooves to guide it. I have therefore shown a part of the periphery of the roll 2 made plain at f, which plain portion acts in conjunction with the plain roll/1 to form the finishingpass. The grooves a b c d are preferably filleted, as shown in the drawing.

By the use of my invention the wearing of the rolls is greatly diminished, and steel strips or bands can be rolled with much less cost than has been possible with the ordinary grooved rolls.

By the use of the term plain roll I mean simply a roll without grooves and collars or tongues.

I claim as my invention-- The combination of a plain roll with an adjacent grooved roll, part of whose periphery is plain, as atf, substantially as and for the purposes described.

In testimony whereofl have hereunto set my hand this 15th day of April, A. D. 1886.

EDVARD L. CLARK.

\Vitnesses:

'I. W. BAKFAVELL, W. B. CORWIN. 

